Whenever i masturbate, i notice that alot of sweat comes from under my balls, is this normal? Is there anyway i can reduce this, because sometimes it gets soo bad that it leaves a sweat stain in my boxers.

Yes, its normal. I get the exact same thing, sweat stains and all. Especially if I edge and masturbate for a long time, it can be a lot of sweat. I don't know of anyway you can reduce this. It's just the body's natural response to being sexually excited.